Process for the level dyeing of polyester material

Abstract

Described is a process for the level dyeing of polyester material by the aqueous exhaust method at temperatures above 100 DEG C., which comprises the use of an aqueous dye liquor which contains at least one migrating disperse dye as well as further ingredients. As migrating disperse dye, preferably a dye is used which has a diffusion coefficient Do at 130 DEG C. of 2 to 10x10-10 cm2/sec, a distribution coefficient K at 130 DEG C. of 20 to 500 1/kg, and a migration half-life t/2 less then 50 minutes.

What is claimed is: 
     
       1. In a process for the level dyeing of polyester material by the exhaustion of three or more disperse dyes from an aqueous liquor at a temperature above 100° C., the improvement wherein all of the selected disperse dyes are migrating disperse dyes, having a diffusion coefficient Do at 130° C. of 2 to 10×10 -10  cm 2  /sec, a distribution coefficient K at 130° C. of 20 to 500 1/kg, and a migration half-life t/2 of less than 50 minutes. 
     
     
       2. An aqueous dye liquor comprising no non-migrating dyes and at least three migrating disperse dyes, having a diffusion coefficient Do at 130° C. of 2 to 10×10 -10  cm 2  /sec, a distribution coefficient K at 130° C. of 20 to 500 1/kg, and a migration half-life t/2 of less than 50 minutes. 
     
     
       3. Polyester material, dyed with at least three migrating disperse dyes, having a diffusion coefficient Do at 130° C. of 2 to 10×10 -10  cm 2  /sec, a distribution coefficient K at 130° C. of 20 to 500 1 kg, and a migration half-life t/2 of less than 50 minutes, in the absence of any non-migrating dyestuff. 
     
     
       4. A process according to claim 1 wherein at least one of the disperse dyes has a diffusion coefficient Do at 130° C. of 2.5 to 10×10 -10  cm 2  /sec, a distribution coefficient K at 130° C. of 60 to 350 1/kg, and a migration half-life t/2 of less than 30 minutes. 
     
     
       5. A process according to claim 2 wherein the dyes constitute a trichromatic system of migrating disperse dyes. 
     
     
       6. A process according to claim 1 wherein the dyes are two or more of the following migrating disperse dyes: ##STR20##   ______________________________________                                    
CI Disperse Blue 26                                                       
(methylated mixture of Do = 4,8                                           
diaminoanthrarufine and                                                   
                       K = 315                                            
diaminochrysazine      t/2 = 22                                           
CI Disperse Blue 95                                                       
(mixture of diaminoan- Do = 4,8                                           
thrarufine and diamino-                                                   
                       K = 315                                            
chrysazine, treated with                                                  
                       t/2 = 22                                           
formaldehyde)                                                             
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       7. A process according to claim 1 wherein the aqueous liquor contains no carrier. 
     
     
       8. A process according to claim 1 wherein the temperature is between 110° and 140° C. under pressure.